diff --git a/Makefile b/Makefile
index 939e2c136d6..d5f52c638a0 100644
--- a/Makefile
+++ b/Makefile
@@ -52,13 +52,16 @@ $(TOOLS)/golangci-lint: PACKAGE=github.com/golangci/golangci-lint/cmd/golangci-l
 MISSPELL = $(TOOLS)/misspell
 $(TOOLS)/misspell: PACKAGE= github.com/client9/misspell/cmd/misspell
 
+GOCOVMERGE = $(TOOLS)/gocovmerge
+$(TOOLS)/gocovmerge: PACKAGE= github.com/wadey/gocovmerge
+
 STRINGER = $(TOOLS)/stringer
 $(TOOLS)/stringer: PACKAGE=golang.org/x/tools/cmd/stringer
 
 $(TOOLS)/gojq: PACKAGE=github.com/itchyny/gojq/cmd/gojq
 
 .PHONY: tools
-tools: $(CROSSLINK) $(GOLANGCI_LINT) $(MISSPELL) $(STRINGER) $(TOOLS)/gojq $(SEMCONVGEN)
+tools: $(CROSSLINK) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(TOOLS)/gojq $(SEMCONVGEN)
 
 
 # Build
@@ -111,19 +114,18 @@ test:
 COVERAGE_MODE    = atomic
 COVERAGE_PROFILE = coverage.out
 .PHONY: test-coverage
-test-coverage:
+test-coverage: | $(GOCOVMERGE)
 	@set -e; \
 	printf "" > coverage.txt; \
 	for dir in $(ALL_COVERAGE_MOD_DIRS); do \
-	  echo "$(GO) test -coverpkg=./... -covermode=$(COVERAGE_MODE) -coverprofile="$(COVERAGE_PROFILE)" $${dir}/..."; \
+	  echo "$(GO) test -coverpkg=go.opentelemetry.io/otel/... -covermode=$(COVERAGE_MODE) -coverprofile="$(COVERAGE_PROFILE)" $${dir}/..."; \
 	  (cd "$${dir}" && \
 	    $(GO) list ./... \
 	    | grep -v third_party \
 	    | xargs $(GO) test -coverpkg=./... -covermode=$(COVERAGE_MODE) -coverprofile="$(COVERAGE_PROFILE)" && \
 	  $(GO) tool cover -html=coverage.out -o coverage.html); \
-	  [ -f "$${dir}/coverage.out" ] && cat "$${dir}/coverage.out" >> coverage.txt; \
 	done; \
-	sed -i.bak -e '2,$$ { /^mode: /d; }' coverage.txt
+	$(GOCOVMERGE) $$(find . -name coverage.out) > coverage.txt
 
 .PHONY: lint
 lint: misspell lint-modules | $(GOLANGCI_LINT)
diff --git a/internal/tools/go.mod b/internal/tools/go.mod
index ec7626c9e01..71e1757ce17 100644
--- a/internal/tools/go.mod
+++ b/internal/tools/go.mod
@@ -7,6 +7,7 @@ require (
 	github.com/gogo/protobuf v1.3.2
 	github.com/golangci/golangci-lint v1.41.1
 	github.com/itchyny/gojq v0.12.4
+	github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad
 	go.opentelemetry.io/build-tools/semconvgen v0.0.0-20210730171444-520d53fe242d
 	golang.org/x/tools v0.1.5
 )
diff --git a/internal/tools/go.sum b/internal/tools/go.sum
index 52808978d80..dc2766fcdeb 100644
--- a/internal/tools/go.sum
+++ b/internal/tools/go.sum
@@ -647,6 +647,8 @@ github.com/valyala/fasthttp v1.16.0/go.mod h1:YOKImeEosDdBPnxc0gy7INqi3m1zK6A+xl
 github.com/valyala/quicktemplate v1.6.3/go.mod h1:fwPzK2fHuYEODzJ9pkw0ipCPNHZ2tD5KW4lOuSdPKzY=
 github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV9WzVtRmSR+PDvWpU/qWl4Wa5LApYYX4ZtKbio=
 github.com/viki-org/dnscache v0.0.0-20130720023526-c70c1f23c5d8/go.mod h1:dniwbG03GafCjFohMDmz6Zc6oCuiqgH6tGNyXTkHzXE=
+github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad h1:W0LEBv82YCGEtcmPA3uNZBI33/qF//HAAs3MawDjRa0=
+github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad/go.mod h1:Hy8o65+MXnS6EwGElrSRjUzQDLXreJlzYLlWiHtt8hM=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
diff --git a/internal/tools/tools.go b/internal/tools/tools.go
index 873343bf4db..7e34a6be860 100644
--- a/internal/tools/tools.go
+++ b/internal/tools/tools.go
@@ -21,6 +21,7 @@ import (
 	_ "github.com/gogo/protobuf/protoc-gen-gogofast"
 	_ "github.com/golangci/golangci-lint/cmd/golangci-lint"
 	_ "github.com/itchyny/gojq"
+	_ "github.com/wadey/gocovmerge"
 	_ "go.opentelemetry.io/build-tools/semconvgen"
 	_ "golang.org/x/tools/cmd/stringer"
 )